Rotary drawworks back brake assembly



Sept. 6, 1932. .1. D. SPALDING ROTARY DRAWWORKS BACK BRAKE ASSEMBLYFiled June 3, 1-929 2 Sheets-Sheet 1 Sept. 6, 1932. I D, SPALDING1,875,769

ROTARY'DRAWWORKS BACK BRAKE ASSEM BLY Filed June 5. 1929 2 Sheets-Sheet2 I v Z5 50 25 x5 1i WW a, fi g WW4 Patented Sept. 6, 1932 UN'TEDSTATESJOHN :D. SPALDING, or caerroiv, PENNSYLVANIA; Assrenoa TQHT'HEmer'rrolmn .SUP-

PLY COMPANY OF DELAWARE, on NEW YORK, N; Y.,'A conrosarro v or DELAWAREp ROTARY nmwwonxs BACK-BRAKE ASSEMBLY Applicatioafiled June 3,

This invention relates to rotary draw works and more particularly to anassembly for forming a unitary structure drawworks whereby the brakeactuating means for the -drawworks islsupportedat the rear of thedrawworks and as a unitary part of the drawworks. i V

a .The drawworks asno commonly constructed for use in connection withrotary machines for carrying out the rotary process of drilling wells itis customary to provide a hoisting .drum having spaced brake bands and abrake actuating means including a brake' equalizer' which must beassembled on the floor of the drilling rig and lined up with the brakebands of the hoisting drum and secured in position.' When thus securedin position the brake actuating means equalizer and supporting structureis in front of: the drum between the drawworks and the rotary machine. VV

It is an object of this invention to provide a means forming a rigidframe of the posts of a rotary drawworks as commonly constructed so thatthe rotary drawworks may be installed in position upon the sills of aderrick, and

which unitary structure includes a means for a supporting the brakeactuating means for the rotary drawworks to the rear of the hoist- 0 ingdrum. 1 l 7 Another object of this invention is to provide a'rota'rydrawworks including a plurality of spaced posts betweenwhich a rotarydrawworks hoisting drum is supported on a shaft, an angle iron securedto the ends of the spaced posts for securing the posts together at theirlower ends, and a brake actuating means secured to the angle iron inposi- 4 tion and as a unitary structure for actuating 4 the spaced apartbrake bands of a rotaryie29. Serial No. v367,931.

g Figure 2 isa sectional edge elevation taken A substantially on theline 2-72 of Figure 1. of

Figure 3 is a sectional plan viewytaken substantially on the line 3-3 ofFigure 1. fl

F igurej l is a sectional end elevation taken, substantiallyon the line4+4 of Figure Ina drawworks construction it is common practice toprovide a frame including two or more spaced posts 1 and 2 upon whichthe drum shaft?) isjournaled Mounted on the drum shaft 3 is a hoistingdrum 4 having spaced brake rims 5 upon which brake bands 6 are mounted.Li v In accordance with the;preferred embodiment of this'inventionillustrated in the accompany'ing drawings, the spaced apart posts 1 and2 are secured together byfmeans of an angle iron 7 which is secured tothe ends of it the posts by means of bolts 8 and withincutout recessesformed at the, lower ends of the posts 1 and 2. The, angle iron is thussupported in positionitorest upon the sill 9 of 'theiderrick in whichtherotary drawworks is mounted. The angle ironwhenthus positioned ontheisill9 is secured in position by the bolts 8 passing throughthe sill9 and may also be securedin position by means of additional boltsLlOpositioned between the bolts 8 and passing'thrOUgh-the vertical web 11ofthe angle iron 7; i a v The angle iron 7 thus forms a means forholding the posts 1 and 2 together at the lower end of the drawworksconstruction, and like wise forms a supporting, means for supportingthedrawworks on the sill 9 of the derrick.-

The angle iron 7 .may,if the frame of the drawworks includes three ormore posts, be alsorconnected in the same manner to" each of theadditionalpost's by bolts similar .to' thebolts 8. V In order to providea unitary structure of drawworks which may be mounted within adrillingrig without'requiring the positioning and centering of a brakeactuatin means, I prefer to mount on the angle llOIl a pair of spacedbrackets 12 which may be securely riveted to the angle iron 7 asindicatediat 13. The bracketsf12 provide 'ameans to' which thedead ends1 10f the brakebands 6 may be secured and locked in position, and alsothe bracket 12. The'two arinc'ollars 26 have their arms 27 connected bymeans of a pin 28 which is releas ably held in position bylikewise'riveted to 'the angle iron 7' '31 towliich the actuating handle25is provide a means for supporting the brake actuating shaft to whichthe live ends 17 of the brake bands 6 are secured, and by means of whichthe brake bands 6 are loosened or tightened as desired upon the brakerims'5. F

The dead ends 14; of the brake bands 6 are secured to the brackets 12 byeye-bolts 18, the eyes of Whichare secured.to the dead ends 14 ofthebrake bands 6 passingthrough" bores 19 formed through the brackets 12;

' The eye-bolts 18 are secured in position by means of nuts 20screw-threaded in the ends of the eye-bolts 18. A lo'ckedjaw 21 ispivotally secured to each bracket 12 by a pin -'22"and fitsfthe nu-t'20,thus holdingthe nut20"locked on the-e'ye-bOlt'lS after the I nut 2O hasbeen tightened up to" the desired degree. .Wh'en' itfis' desired toadjust the dead ends 14 of the brake'band 6, the lock jaw"2l';may berotated on its-pivot 22 out of l locking position. lVhe'n in lockingposition the'lock jaw 21 is held bygravity in engagemerit w'iththe nut'20.

The actuating shaft 15- for the live end 17 of the b'rakejband 6is'supportedby' the bearingbi' ac'kets 12 by passing through bearingbosses 23 formed in the upper ends of the brackets 12 and within whichbearing bosses 23 the actuating shaft 15is" journale'd. The actuatingshaft 15 is also su'pp'orted'from the angle iron"?- by' a'th-ird bracket24, which is and-supports the outerend Ofthe-aCtuating shaft 15bey'on-d'the actuating lever 25.

'Themeansherein illustrated for securing if the live 'end 17; to'eachbrake band 6 tothe actuating shaft 15'includes arm collars 26 which aresecured to'the' actuating'shaft 15 on opposite sidesof' thebearing boss23 of means of a cotter pin 29;

The ends of the eye-straps 30'of the brake bands' 6 are journaled'onthepins28.

Secured to'the actuating shaft15 intermediate one of the br'ackets'12and the bracket 2-4 at the Iendof' the drum 4 is a bracket releasablysecured by means of bolts, 32. blecured to the bracket-31 is'an arm 33'which carries an adjustable weight 34 normally tending to'rotat'e theactuating shaft- 15 to-a position to release the tension of the'brakebands 6' on thebrakerims 5.

Having fully described my invention, it is to be understood that I donot'wish to be: limited t'o thedetails'herein set forth, but myinvention is o f the full scope of the ap pended claims.

T'claiiii': g 1. In a rotary drawworks, the'combination of a-'frame'chidmg spaced posts, an angle iron secured to the lower ends of saidposts,

bands mountedon the brake rims,

secured to theangle ironin alignment' with. thebrake rims, the brakeband actuating shaft being rotatably supported by saidbracketslalignment with the a drum shaft supported by the posts, a drum mountedon the drum shaft, the drum providing spaced brake rims, brake bandsmounted on the brake rims, brackets secured to the angle iron inalignment with the, brake"rims meanswfor securing the dead ends of thebrake bands to said brackets, and a brake band actuating shaft rotatablysupported by the said brackets and secured to the live ends of saidbrake'bands.

2. In arotary drawworks, the combination of a frame including spacedposts, an angle iron secured to the lower endsof said post inrecesses'formed in the posts, a drum shaft supported by the posts, adrum mounted on the shaft, the drum" providing. spaced brake rims, brakebands mounted on the brake rims,brackets secured to'the angle irons-andin alignment with the brake'rims, means for securing the deadends o-fthe brake bands to said brackets, a brake ban 'd actuatingshaft andproviding brake actuating arms, means for' se'curi'ng'thelive ends ofsaidbrakebands to said arms, and means for' actuating the said brakeband'factuating shaft.

4. In a rotary drawworks, the'combination of frame including spacedposts, an angle iron secured to the lowerends of said posts tomaintainthe I said posts 'in' spaced relation at their lower ends, adrum shaft supported by the posts, a drum mountedon. the drum shaft, the

drum providing. spaced brake rims, brake bandsmountedon the brake rims,brackets" secured to the angle iron in .brake rinis, means foradjustably securing brake bands to said brackets,means for locking thelatter said means in adjustment, the brake band actuating shaft beingrotatably supported by the brackets, means for securing the live ends ofsaid bi'ake' bands to said shaft, and means for actuating'the said shaftto tighten said brake rims on said brake bands.

5 In a device of the: class des'cribe d, the combination of a frame, aderrick sill, an

angle iron mounted at the lower end of said frame and extendinglongitudinally thereof for. supporting said frame upon said derrick sill.,.a hoisting drumsupported by said frame,

'said supporting drum having brake rims at the dead ends of theitsopposed ends, brake bands mounted on said brake rims, brackets mountedonsaid angle iron in alignment with said brake rims, a shaft journaledin said brackets, means for securing the live ends of the brake bands tosaid shaft, means for adjustably securing the dead ends of the brakebands to said brackets, and means for rotating the said shaft to actuatethe live ends of the brake bands.

6. In combination with a drawworks drum having a pair of brake rims atits opposed ends, of a brake band mounted upon each rim, a supportingangle iron mounted in position to the rear of the axis of said drum, apair of spaced brackets secured to said angle iron in alignment withsaid brake rims, a brake actuating shaft journaled in said brackets,means secured to said shaft and to the live ends of the brake bands foractuating the brake bands, the latter said means being aligned with thebrake bands and said brackets so that the braking force is transmitteddirectly to said angle iron, adjusting means for the dead ends of saidbrake bands, said adjusting means being operatively coupled to saidbrackets, and means for locking said adjusting means in adjustedposition.

7 In a device of the class described, the combination of a frame, aderrick sill, a member mounted at the lower end of said frame andextending longitudinally thereof for supporting said frame upon saidderrick sill, a hoisting drum supported b said frame, said supportingdrum having brake rims at its opposed ends, brake bands mounted on saidbrake rims, securing means mounted on said member in alignment with saidbrake rims, a shaft journaled in said securing means, means for securingthe live ends of the brake bands to said shaft, means for adjustablysecuring the dead ends of the brake bands to said longitudinal member,and means for rotating the said shaft to actuate the live ends of thebrake bands.

8. In a drilling rig including a sill, the combination of a drawworksincluding a frame having spaced posts, an angle iron secured to thelower ends of said posts, said angle iron being adapted to fit upon thesill, a drum shaft supported by the posts, a drum mounted on the drumshaft, the drum'providing spaced brake rims, brake bands mounted on thebrake rims, brackets secured to the said angle iron, a shaft rotatablysupported by said brackets, means for securing the live ends of saidbrake bands to said shaft, and means for actuating the shaft to tightenthe brake bands on said brake rims.

9. In a drilling rig including a sill, the

ends of said posts to hold the lower ends of said posts in spacedrelation, the said angle iron being adapted to fit upon and be securedto the sill, means adapted to secure the angle iron to said sill, a drumshaft supported by the posts, a drum mounted on the drum shaft, the drumbeing provided with spaced brake rims, brake bands mounted on the brakerims, brackets secured to the angle iron in alignment with the brakerims, means for adjustably securing the dead ends of the fit upon thederrick sill, a drum shaft rotatably journaled in the supports, a drummounted on the drum shaft, the drum providing a brake rim, a brake bandon said brake rim, a bracket secured to the said angle iron, a shaftrotatably supported by said bracket, means for securing the live end ofsaid brake band to said shaft, and meansfor actuating the shafttotighten the brake band on said brake rim. 7

11. In combination with a well hoisting apparatus supported on a derricksill, the

combination of a frame including spaced posts having recesses at thelower ends thereof, an angle iron securedto the lower end of said postsin the recesses formed at the ends of said posts to holdthe lower endsof said posts in spaced relation, the said angle iron being adapted tofit upon and be secured to the derrick sill, means adapted to secure theangle iron to said sill, a drum shaft supported by the posts, a drummounted on the drum shaft, the drum being provided with a brake rim, abrake band mounted on the brake rim, a bracket secured to the angle ironin align ment with the brake rim, means for adjustably securing the'deadend of the brake hand to said bracket, locking means pivotally supportedby said bracket for locking the latter said means in adjustment, a brakeband actuating shaft rotatably supported by said bracket, crank meansfor securing the live. end of the brake band to said shaft, and meansfor actuating said shaft.

Signed at Carnegie, Penna, this 23rd day of May, 1929.

JOHN D. ,SPALDING.

